Positioning the switch in this mode enables the automatic control of the machines to use information entered in the form of blocks without interfering with the basic program.

开关定位在此模式，可以利用与基本程序没有冲突的程序段形式进行信息输入，实现机床的自动控制。

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Firstly, the thesis researches the basic theory of the GPS and GIS, which provide corresponding concepts for researching map matching algorithms with GPS positioning information and digital map data.

首先本文阐述了GPS和GIS的基本原理，为利用GPS定位信息和电子地图信息进行地图匹配算法的研究提供了相关理论。

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